How to encode the " ' " character - php

Question

I'm writing a facebook application that post messages into the feed. When i'm trying to post the message "I'm Roy" to my feed using the graph API with HTTP POST, I keep getting the following result "I\'m Roy". Why is that? I'm using PHP to call the graph API, and wrap my message text with urlencode().
What do I miss?
This is my PHP code:
function POST_feeds($parameters)
{
//extract data from the post
extract($_POST);
//set POST variables
$url = 'https://graph.facebook.com/' . $parameters["facebookUserId"] . "/feed";
$fields = array(
'access_token' => $this->accessToken,
'message' => $parameters["message"]
);
//url-ify the data for the POST
foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
rtrim($fields_string, '&');
//open connection
$ch = curl_init();
//set the url, number of POST vars, POST data
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch,CURLOPT_POST, count($fields));
curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);
//execute post
$facebookResponse = curl_exec($ch);
//close connection
curl_close($ch);
$response = new Response();
$response->addItem($facebookResponse);
return response;
}
UPDATE
the PHP function above is getting its parameters from the POST parameters of the following XMLHttpRequest request:
var xhr = new XMLHttpRequest();
xhr.open("POST", webServiceUrl + "feeds", true);
var params = "facebookUserId=" + facebookUserId + "&message=" + message;
print(params);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded; charset=UTF-8");
xhr.setRequestHeader("Content-length", params.length);
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
print(xhr.responseText);
var responseObject = JSON.parse(xhr.responseText);
successCallback(responseObject);
} else {
failureCallback();
}
}
};
xhr.send(params);
It seems that the problem starts from the javascript code (when i try to hardcode some message with the " ' " character in my PHP code its all works fine).
Thanks!

Answer 1

You shouldn't be urlencoding your data, the php facebook api takes care of that for you.
--- original answer
You have to use double quotes " on the outside in order to parse escaped characters. Also if you are using double-outer-quotes you don't need to escape '
"I\'m Roy"
is not the same as
'I\'m Roy'

Answer 2

Give this one a try: http://php.net/manual/en/function.urlencode.php ?
You might want to use it in conjunction with htmlentities() as noted in the docs if you have html tags in the string as well...